develops from procephalic neurogenic region procephalic neuroblast Neuroblast of one of the three procephalic regions, protocerebrum, deutocerebrum and tritocerebrum, which form the supraesophageal ganglion of the brain (Urbach et al., 2003). These neuroblasts derive from the procephalic neurogenic region (Urbach et al., 2003). brain neuroblast fly_anatomy.ontology VFB:FBbt_00001333 FBbt:00001333 neuroblast of supraesophageal ganglion neuroblast anterior ectoderm derivative